RF and Microwave Circulators
and Isolators

Ferrite circulators are passive three-port devices in
which an RF or microwave signal is transmitted from one port to the next
port, but not to the third port. They are mainly used to protect
amplifiers from reflected signas if there is a defect in the cable or
antenna after the amplifier. Another usage is the separation of
transmitted and received signas in systems which operate in the same
frequency band for transmission and reception, e.g. RFID. The ports are
matched inside the housing or on the microstip board to 50 Ohm. RF
isolators have one port terminated with a power resistor.

Coaxial Cavity Filters

These coaxial filters use cavity resonances to achieve high Q and thus low insertion loss, steep skirts and high isolation. JQL offers various categories of cavity filters.
All standard designs can be modified easily and quickly to meet customer specific requirements.